Prairie du Chien, WI 53821 Frost Dates
Prairie du Chien, WI: when does the frost end?
Typically, the last spring freeze lands around 04/28, roughly 243 days out. Fall's first freeze usually shows up around 10/12, roughly 166 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Prairie du Chien in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 6 weeks until Prairie du Chien's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Prairie du Chien's last frost
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Prairie du Chien against the rest of the dataset
About 166 days separate Prairie du Chien's last and first frost, putting it 30,361 of 40,283 ZIP codes nationally. Within WI, it ranks 174 of 860.
Learn more
Before leaning on 53821's figures: local microclimates explains what one yard in Prairie du Chien can differ from the 53821 normal, while zone vs. frost date explains why Zone 5a and Prairie du Chien's frost date answer different questions.